diff options
| author | brezak <brezak@NetBSD.org> | 1993-12-21 04:17:02 +0000 |
|---|---|---|
| committer | brezak <brezak@NetBSD.org> | 1993-12-21 04:17:02 +0000 |
| commit | e678ab82420f9e967d472f4e8fa464f0bfb7f654 (patch) | |
| tree | c62a5f9146a0c14a8f4d3ca683499288e0ec487b /sys/dev | |
| parent | 30669098ece3cc1943a06dc028efce1cfc5cc2be (diff) | |
vnode driver (from Mike Hibler make@cs.utah.edu)
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/vn.c | 555 | ||||
| -rw-r--r-- | sys/dev/vnd.c | 555 | ||||
| -rw-r--r-- | sys/dev/vndioctl.h | 61 | ||||
| -rw-r--r-- | sys/dev/vnioctl.h | 61 |
4 files changed, 1232 insertions, 0 deletions
diff --git a/sys/dev/vn.c b/sys/dev/vn.c new file mode 100644 index 00000000000..f7f2470d6f4 --- /dev/null +++ b/sys/dev/vn.c @@ -0,0 +1,555 @@ +/* + * Copyright (c) 1988 University of Utah. + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: Utah $Hdr: vn.c 1.8 92/12/20$ + * + * @(#)vn.c 8.1 (Berkeley) 6/10/93 + */ + +/* + * Vnode disk driver. + * + * Block/character interface to a vnode. Allows one to treat a file + * as a disk (e.g. build a filesystem in it, mount it, etc.). + * + * NOTE 1: This uses the VOP_BMAP/VOP_STRATEGY interface to the vnode + * instead of a simple VOP_RDWR. We do this to avoid distorting the + * local buffer cache. + * + * NOTE 2: There is a security issue involved with this driver. + * Once mounted all access to the contents of the "mapped" file via + * the special file is controlled by the permissions on the special + * file, the protection of the mapped file is ignored (effectively, + * by using root credentials in all transactions). + * + * NOTE 3: Doesn't interact with leases, should it? + */ +#include "vn.h" +#if NVN > 0 + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/namei.h> +#include <sys/proc.h> +#include <sys/errno.h> +#include <sys/dkstat.h> +#include <sys/buf.h> +#include <sys/malloc.h> +#include <sys/ioctl.h> +#include <sys/mount.h> +#include <sys/vnode.h> +#include <sys/file.h> +#include <sys/uio.h> + +#include <miscfs/specfs/specdev.h> + +#include <dev/vnioctl.h> + +#ifdef DEBUG +int vndebug = 0x00; +#define VDB_FOLLOW 0x01 +#define VDB_INIT 0x02 +#define VDB_IO 0x04 +#endif + +#define b_cylin b_resid + +#define vnunit(x) ((minor(x) >> 3) & 0x7) /* for consistency */ + +#define getvnbuf() \ + ((struct buf *)malloc(sizeof(struct buf), M_DEVBUF, M_WAITOK)) +#define putvnbuf(bp) \ + free((caddr_t)(bp), M_DEVBUF) + +struct vn_softc { + int sc_flags; /* flags */ + size_t sc_size; /* size of vn */ + struct vnode *sc_vp; /* vnode */ + struct ucred *sc_cred; /* credentials */ + int sc_maxactive; /* max # of active requests */ + struct buf sc_tab; /* transfer queue */ +}; + +/* sc_flags */ +#define VNF_ALIVE 0x01 +#define VNF_INITED 0x02 + +#if 0 /* if you need static allocation */ +struct vn_softc vn_softc[NVN]; +int numvnd = NVN; +#else +struct vn_softc *vn_softc; +int numvnd; +#endif + +void +vnattach(num) + int num; +{ + char *mem; + register u_long size; + + if (num <= 0) + return; + size = num * sizeof(struct vn_softc); + mem = malloc(size, M_DEVBUF, M_NOWAIT); + if (mem == NULL) { + printf("WARNING: no memory for vnode disks\n"); + return; + } + bzero(mem, size); + vn_softc = (struct vn_softc *)mem; + numvnd = num; +} + +int +vnopen(dev, flags, mode, p) + dev_t dev; + int flags, mode; + struct proc *p; +{ + int unit = vnunit(dev); + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnopen(%x, %x, %x, %x)\n", dev, flags, mode, p); +#endif + if (unit >= numvnd) + return(ENXIO); + return(0); +} + +/* + * Break the request into bsize pieces and submit using VOP_BMAP/VOP_STRATEGY. + * Note that this driver can only be used for swapping over NFS on the hp + * since nfs_strategy on the vax cannot handle u-areas and page tables. + */ +vnstrategy(bp) + register struct buf *bp; +{ + int unit = vnunit(bp->b_dev); + register struct vn_softc *vn = &vn_softc[unit]; + register struct buf *nbp; + register int bn, bsize, resid; + register caddr_t addr; + int sz, flags; + extern void vniodone(); + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnstrategy(%x): unit %d\n", bp, unit); +#endif + if ((vn->sc_flags & VNF_INITED) == 0) { + bp->b_error = ENXIO; + bp->b_flags |= B_ERROR; + biodone(bp); + return; + } + bn = bp->b_blkno; + sz = howmany(bp->b_bcount, DEV_BSIZE); + bp->b_resid = bp->b_bcount; + if (bn < 0 || bn + sz > vn->sc_size) { + if (bn != vn->sc_size) { + bp->b_error = EINVAL; + bp->b_flags |= B_ERROR; + } + biodone(bp); + return; + } + bn = dbtob(bn); +#ifdef BSD44 + bsize = vn->sc_vp->v_mount->mnt_stat.f_iosize; +#else + bsize = vn->sc_vp->v_mount->mnt_stat.f_bsize; +#endif + addr = bp->b_un.b_addr; + flags = bp->b_flags | B_CALL; + for (resid = bp->b_resid; resid; resid -= sz) { + struct vnode *vp; + daddr_t nbn; + int off, s; + + nbp = getvnbuf(); + off = bn % bsize; + sz = min(bsize - off, resid); +#ifdef BSD44 + (void) VOP_BMAP(vn->sc_vp, bn / bsize, &vp, &nbn, NULL); +#else + (void) VOP_BMAP(vn->sc_vp, bn / bsize, &vp, &nbn); +#endif +#ifdef DEBUG + if (vndebug & VDB_IO) + printf("vnstrategy: vp %x/%x bn %x/%x\n", + vn->sc_vp, vp, bn, nbn); +#endif + nbp->b_flags = flags; + nbp->b_bcount = sz; + nbp->b_bufsize = bp->b_bufsize; + nbp->b_error = 0; + if (vp->v_type == VBLK || vp->v_type == VCHR) + nbp->b_dev = vp->v_rdev; + else + nbp->b_dev = NODEV; + nbp->b_un.b_addr = addr; + nbp->b_blkno = nbn + btodb(off); + nbp->b_proc = bp->b_proc; + nbp->b_iodone = vniodone; + nbp->b_vp = vp; + nbp->b_pfcent = (int) bp; /* XXX */ + nbp->b_rcred = vn->sc_cred; /* XXX crdup? */ + nbp->b_wcred = vn->sc_cred; /* XXX crdup? */ +#ifdef BSD44 + nbp->b_dirtyoff = bp->b_dirtyoff; + nbp->b_dirtyend = bp->b_dirtyend; + nbp->b_validoff = bp->b_validoff; + nbp->b_validend = bp->b_validend; +#endif + /* + * There is a hole in the file...punt. + * Note that we deal with this after the nbp allocation. + * This ensures that we properly clean up any operations + * that we have already fired off. + * + * XXX we could deal with this but it would be + * a hassle (in the write case). + */ + if ((long)nbn == -1) { + nbp->b_error = EIO; + nbp->b_flags |= B_ERROR; + bp->b_resid -= (resid - sz); + biodone(nbp); + return; + } + /* + * Just sort by block number + */ + nbp->b_cylin = nbp->b_blkno; + s = splbio(); + disksort(&vn->sc_tab, nbp); + if (vn->sc_tab.b_active < vn->sc_maxactive) { + vn->sc_tab.b_active++; + vnstart(vn); + } + splx(s); + bn += sz; + addr += sz; + } +} + +/* + * Feed requests sequentially. + * We do it this way to keep from flooding NFS servers if we are connected + * to an NFS file. This places the burden on the client rather than the + * server. + */ +vnstart(vn) + register struct vn_softc *vn; +{ + register struct buf *bp; + + /* + * Dequeue now since lower level strategy routine might + * queue using same links + */ + bp = vn->sc_tab.b_actf; + vn->sc_tab.b_actf = bp->b_actf; +#ifdef DEBUG + if (vndebug & VDB_IO) + printf("vnstart(%d): bp %x vp %x blkno %x addr %x cnt %x\n", + vn-vn_softc, bp, bp->b_vp, bp->b_blkno, bp->b_un.b_addr, + bp->b_bcount); +#endif + if ((bp->b_flags & B_READ) == 0) + bp->b_vp->v_numoutput++; + VOP_STRATEGY(bp); +} + +void +vniodone(bp) + register struct buf *bp; +{ + register struct buf *pbp = (struct buf *)bp->b_pfcent; /* XXX */ + register struct vn_softc *vn = &vn_softc[vnunit(pbp->b_dev)]; + int s; + + s = splbio(); +#ifdef DEBUG + if (vndebug & VDB_IO) + printf("vniodone(%d): bp %x vp %x blkno %x addr %x cnt %x\n", + vn-vn_softc, bp, bp->b_vp, bp->b_blkno, bp->b_un.b_addr, + bp->b_bcount); +#endif + if (bp->b_error) { +#ifdef DEBUG + if (vndebug & VDB_IO) + printf("vniodone: bp %x error %d\n", bp, bp->b_error); +#endif + pbp->b_flags |= B_ERROR; + pbp->b_error = biowait(bp); + } + pbp->b_resid -= bp->b_bcount; + putvnbuf(bp); + if (pbp->b_resid == 0) { +#ifdef DEBUG + if (vndebug & VDB_IO) + printf("vniodone: pbp %x iodone\n", pbp); +#endif + biodone(pbp); + } + if (vn->sc_tab.b_actf) + vnstart(vn); + else + vn->sc_tab.b_active--; + splx(s); +} + +vnread(dev, uio, flags, p) + dev_t dev; + struct uio *uio; + int flags; + struct proc *p; +{ + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnread(%x, %x, %x, %x)\n", dev, uio, flags, p); +#endif + return(physio(vnstrategy, NULL, dev, B_READ, minphys, uio)); +} + +vnwrite(dev, uio, flags, p) + dev_t dev; + struct uio *uio; + int flags; + struct proc *p; +{ + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnwrite(%x, %x, %x, %x)\n", dev, uio, flags, p); +#endif + return(physio(vnstrategy, NULL, dev, B_WRITE, minphys, uio)); +} + +/* ARGSUSED */ +vnioctl(dev, cmd, data, flag, p) + dev_t dev; + u_long cmd; + caddr_t data; + int flag; + struct proc *p; +{ + int unit = vnunit(dev); + register struct vn_softc *vn; + struct vn_ioctl *vio; + struct vattr vattr; + struct nameidata nd; + int error; + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnioctl(%x, %x, %x, %x, %x): unit %d\n", + dev, cmd, data, flag, p, unit); +#endif + error = suser(p->p_ucred, &p->p_acflag); + if (error) + return (error); + if (unit >= numvnd) + return (ENXIO); + + vn = &vn_softc[unit]; + vio = (struct vn_ioctl *)data; + switch (cmd) { + + case VNIOCSET: + if (vn->sc_flags & VNF_INITED) + return(EBUSY); + /* + * Always open for read and write. + * This is probably bogus, but it lets vn_open() + * weed out directories, sockets, etc. so we don't + * have to worry about them. + */ +#ifdef BSD44 + NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vn_file, p); + if (error = vn_open(&nd, FREAD|FWRITE, 0)) + return(error); +#else + nd.ni_nameiop = LOOKUP | FOLLOW; + nd.ni_segflg = UIO_USERSPACE; + nd.ni_dirp = vio->vn_file; + if (error = vn_open(&nd, p, FREAD|FWRITE, 0)) + return(error); +#endif + if (error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p)) { + VOP_UNLOCK(nd.ni_vp); + (void) vn_close(nd.ni_vp, FREAD|FWRITE, p->p_ucred, p); + return(error); + } + VOP_UNLOCK(nd.ni_vp); + vn->sc_vp = nd.ni_vp; + vn->sc_size = btodb(vattr.va_size); /* note truncation */ + if (error = vnsetcred(vn, p->p_ucred)) { + (void) vn_close(vn->sc_vp, FREAD|FWRITE, p->p_ucred, p); + return(error); + } + vnthrottle(vn, vn->sc_vp); + vio->vn_size = dbtob(vn->sc_size); + vn->sc_flags |= VNF_INITED; +#ifdef DEBUG + if (vndebug & VDB_INIT) + printf("vnioctl: SET vp %x size %x\n", + vn->sc_vp, vn->sc_size); +#endif + break; + + case VNIOCCLR: + if ((vn->sc_flags & VNF_INITED) == 0) + return(ENXIO); + vnclear(vn); +#ifdef DEBUG + if (vndebug & VDB_INIT) + printf("vnioctl: CLRed\n"); +#endif + break; + + default: + return(ENXIO); + } + return(0); +} + +/* + * Duplicate the current processes' credentials. Since we are called only + * as the result of a SET ioctl and only root can do that, any future access + * to this "disk" is essentially as root. Note that credentials may change + * if some other uid can write directly to the mapped file (NFS). + */ +vnsetcred(vn, cred) + register struct vn_softc *vn; + struct ucred *cred; +{ + struct uio auio; + struct iovec aiov; + char tmpbuf[DEV_BSIZE]; + + vn->sc_cred = crdup(cred); + /* XXX: Horrible kludge to establish credentials for NFS */ + aiov.iov_base = tmpbuf; + aiov.iov_len = min(DEV_BSIZE, dbtob(vn->sc_size)); + auio.uio_iov = &aiov; + auio.uio_iovcnt = 1; + auio.uio_offset = 0; + auio.uio_rw = UIO_READ; + auio.uio_segflg = UIO_SYSSPACE; + auio.uio_resid = aiov.iov_len; + return(VOP_READ(vn->sc_vp, &auio, 0, vn->sc_cred)); +} + +/* + * Set maxactive based on FS type + */ +vnthrottle(vn, vp) + register struct vn_softc *vn; + struct vnode *vp; +{ +#ifdef NFSCLIENT +#ifdef BSD44 + extern int (**nfsv2_vnodeop_p)(); +#else + extern struct vnodeops nfsv2_vnodeops; + struct vnodeops (**nfsv2_vnodeop_p)() = nfsv2_vnodeops; +#endif + if (vp->v_op == nfsv2_vnodeop_p) + vn->sc_maxactive = 2; + else +#endif + vn->sc_maxactive = 8; + + if (vn->sc_maxactive < 1) + vn->sc_maxactive = 1; +} + +vnshutdown() +{ + register struct vn_softc *vn; + + for (vn = &vn_softc[0]; vn < &vn_softc[numvnd]; vn++) + if (vn->sc_flags & VNF_INITED) + vnclear(vn); +} + +vnclear(vn) + register struct vn_softc *vn; +{ + register struct vnode *vp = vn->sc_vp; + struct proc *p = curproc; /* XXX */ + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnclear(%x): vp %x\n", vp); +#endif + vn->sc_flags &= ~VNF_INITED; + if (vp == (struct vnode *)0) + panic("vnioctl: null vp"); +#if 0 + /* XXX - this doesn't work right now */ + (void) VOP_FSYNC(vp, 0, vn->sc_cred, MNT_WAIT, p); +#endif + (void) vn_close(vp, FREAD|FWRITE, vn->sc_cred, p); + crfree(vn->sc_cred); + vn->sc_vp = (struct vnode *)0; + vn->sc_cred = (struct ucred *)0; + vn->sc_size = 0; +} + +vnsize(dev) + dev_t dev; +{ + int unit = vnunit(dev); + register struct vn_softc *vn = &vn_softc[unit]; + + if (unit >= numvnd || (vn->sc_flags & VNF_INITED) == 0) + return(-1); + return(vn->sc_size); +} + +vndump(dev) +{ + return(ENXIO); +} +#endif diff --git a/sys/dev/vnd.c b/sys/dev/vnd.c new file mode 100644 index 00000000000..f7f2470d6f4 --- /dev/null +++ b/sys/dev/vnd.c @@ -0,0 +1,555 @@ +/* + * Copyright (c) 1988 University of Utah. + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: Utah $Hdr: vn.c 1.8 92/12/20$ + * + * @(#)vn.c 8.1 (Berkeley) 6/10/93 + */ + +/* + * Vnode disk driver. + * + * Block/character interface to a vnode. Allows one to treat a file + * as a disk (e.g. build a filesystem in it, mount it, etc.). + * + * NOTE 1: This uses the VOP_BMAP/VOP_STRATEGY interface to the vnode + * instead of a simple VOP_RDWR. We do this to avoid distorting the + * local buffer cache. + * + * NOTE 2: There is a security issue involved with this driver. + * Once mounted all access to the contents of the "mapped" file via + * the special file is controlled by the permissions on the special + * file, the protection of the mapped file is ignored (effectively, + * by using root credentials in all transactions). + * + * NOTE 3: Doesn't interact with leases, should it? + */ +#include "vn.h" +#if NVN > 0 + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/namei.h> +#include <sys/proc.h> +#include <sys/errno.h> +#include <sys/dkstat.h> +#include <sys/buf.h> +#include <sys/malloc.h> +#include <sys/ioctl.h> +#include <sys/mount.h> +#include <sys/vnode.h> +#include <sys/file.h> +#include <sys/uio.h> + +#include <miscfs/specfs/specdev.h> + +#include <dev/vnioctl.h> + +#ifdef DEBUG +int vndebug = 0x00; +#define VDB_FOLLOW 0x01 +#define VDB_INIT 0x02 +#define VDB_IO 0x04 +#endif + +#define b_cylin b_resid + +#define vnunit(x) ((minor(x) >> 3) & 0x7) /* for consistency */ + +#define getvnbuf() \ + ((struct buf *)malloc(sizeof(struct buf), M_DEVBUF, M_WAITOK)) +#define putvnbuf(bp) \ + free((caddr_t)(bp), M_DEVBUF) + +struct vn_softc { + int sc_flags; /* flags */ + size_t sc_size; /* size of vn */ + struct vnode *sc_vp; /* vnode */ + struct ucred *sc_cred; /* credentials */ + int sc_maxactive; /* max # of active requests */ + struct buf sc_tab; /* transfer queue */ +}; + +/* sc_flags */ +#define VNF_ALIVE 0x01 +#define VNF_INITED 0x02 + +#if 0 /* if you need static allocation */ +struct vn_softc vn_softc[NVN]; +int numvnd = NVN; +#else +struct vn_softc *vn_softc; +int numvnd; +#endif + +void +vnattach(num) + int num; +{ + char *mem; + register u_long size; + + if (num <= 0) + return; + size = num * sizeof(struct vn_softc); + mem = malloc(size, M_DEVBUF, M_NOWAIT); + if (mem == NULL) { + printf("WARNING: no memory for vnode disks\n"); + return; + } + bzero(mem, size); + vn_softc = (struct vn_softc *)mem; + numvnd = num; +} + +int +vnopen(dev, flags, mode, p) + dev_t dev; + int flags, mode; + struct proc *p; +{ + int unit = vnunit(dev); + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnopen(%x, %x, %x, %x)\n", dev, flags, mode, p); +#endif + if (unit >= numvnd) + return(ENXIO); + return(0); +} + +/* + * Break the request into bsize pieces and submit using VOP_BMAP/VOP_STRATEGY. + * Note that this driver can only be used for swapping over NFS on the hp + * since nfs_strategy on the vax cannot handle u-areas and page tables. + */ +vnstrategy(bp) + register struct buf *bp; +{ + int unit = vnunit(bp->b_dev); + register struct vn_softc *vn = &vn_softc[unit]; + register struct buf *nbp; + register int bn, bsize, resid; + register caddr_t addr; + int sz, flags; + extern void vniodone(); + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnstrategy(%x): unit %d\n", bp, unit); +#endif + if ((vn->sc_flags & VNF_INITED) == 0) { + bp->b_error = ENXIO; + bp->b_flags |= B_ERROR; + biodone(bp); + return; + } + bn = bp->b_blkno; + sz = howmany(bp->b_bcount, DEV_BSIZE); + bp->b_resid = bp->b_bcount; + if (bn < 0 || bn + sz > vn->sc_size) { + if (bn != vn->sc_size) { + bp->b_error = EINVAL; + bp->b_flags |= B_ERROR; + } + biodone(bp); + return; + } + bn = dbtob(bn); +#ifdef BSD44 + bsize = vn->sc_vp->v_mount->mnt_stat.f_iosize; +#else + bsize = vn->sc_vp->v_mount->mnt_stat.f_bsize; +#endif + addr = bp->b_un.b_addr; + flags = bp->b_flags | B_CALL; + for (resid = bp->b_resid; resid; resid -= sz) { + struct vnode *vp; + daddr_t nbn; + int off, s; + + nbp = getvnbuf(); + off = bn % bsize; + sz = min(bsize - off, resid); +#ifdef BSD44 + (void) VOP_BMAP(vn->sc_vp, bn / bsize, &vp, &nbn, NULL); +#else + (void) VOP_BMAP(vn->sc_vp, bn / bsize, &vp, &nbn); +#endif +#ifdef DEBUG + if (vndebug & VDB_IO) + printf("vnstrategy: vp %x/%x bn %x/%x\n", + vn->sc_vp, vp, bn, nbn); +#endif + nbp->b_flags = flags; + nbp->b_bcount = sz; + nbp->b_bufsize = bp->b_bufsize; + nbp->b_error = 0; + if (vp->v_type == VBLK || vp->v_type == VCHR) + nbp->b_dev = vp->v_rdev; + else + nbp->b_dev = NODEV; + nbp->b_un.b_addr = addr; + nbp->b_blkno = nbn + btodb(off); + nbp->b_proc = bp->b_proc; + nbp->b_iodone = vniodone; + nbp->b_vp = vp; + nbp->b_pfcent = (int) bp; /* XXX */ + nbp->b_rcred = vn->sc_cred; /* XXX crdup? */ + nbp->b_wcred = vn->sc_cred; /* XXX crdup? */ +#ifdef BSD44 + nbp->b_dirtyoff = bp->b_dirtyoff; + nbp->b_dirtyend = bp->b_dirtyend; + nbp->b_validoff = bp->b_validoff; + nbp->b_validend = bp->b_validend; +#endif + /* + * There is a hole in the file...punt. + * Note that we deal with this after the nbp allocation. + * This ensures that we properly clean up any operations + * that we have already fired off. + * + * XXX we could deal with this but it would be + * a hassle (in the write case). + */ + if ((long)nbn == -1) { + nbp->b_error = EIO; + nbp->b_flags |= B_ERROR; + bp->b_resid -= (resid - sz); + biodone(nbp); + return; + } + /* + * Just sort by block number + */ + nbp->b_cylin = nbp->b_blkno; + s = splbio(); + disksort(&vn->sc_tab, nbp); + if (vn->sc_tab.b_active < vn->sc_maxactive) { + vn->sc_tab.b_active++; + vnstart(vn); + } + splx(s); + bn += sz; + addr += sz; + } +} + +/* + * Feed requests sequentially. + * We do it this way to keep from flooding NFS servers if we are connected + * to an NFS file. This places the burden on the client rather than the + * server. + */ +vnstart(vn) + register struct vn_softc *vn; +{ + register struct buf *bp; + + /* + * Dequeue now since lower level strategy routine might + * queue using same links + */ + bp = vn->sc_tab.b_actf; + vn->sc_tab.b_actf = bp->b_actf; +#ifdef DEBUG + if (vndebug & VDB_IO) + printf("vnstart(%d): bp %x vp %x blkno %x addr %x cnt %x\n", + vn-vn_softc, bp, bp->b_vp, bp->b_blkno, bp->b_un.b_addr, + bp->b_bcount); +#endif + if ((bp->b_flags & B_READ) == 0) + bp->b_vp->v_numoutput++; + VOP_STRATEGY(bp); +} + +void +vniodone(bp) + register struct buf *bp; +{ + register struct buf *pbp = (struct buf *)bp->b_pfcent; /* XXX */ + register struct vn_softc *vn = &vn_softc[vnunit(pbp->b_dev)]; + int s; + + s = splbio(); +#ifdef DEBUG + if (vndebug & VDB_IO) + printf("vniodone(%d): bp %x vp %x blkno %x addr %x cnt %x\n", + vn-vn_softc, bp, bp->b_vp, bp->b_blkno, bp->b_un.b_addr, + bp->b_bcount); +#endif + if (bp->b_error) { +#ifdef DEBUG + if (vndebug & VDB_IO) + printf("vniodone: bp %x error %d\n", bp, bp->b_error); +#endif + pbp->b_flags |= B_ERROR; + pbp->b_error = biowait(bp); + } + pbp->b_resid -= bp->b_bcount; + putvnbuf(bp); + if (pbp->b_resid == 0) { +#ifdef DEBUG + if (vndebug & VDB_IO) + printf("vniodone: pbp %x iodone\n", pbp); +#endif + biodone(pbp); + } + if (vn->sc_tab.b_actf) + vnstart(vn); + else + vn->sc_tab.b_active--; + splx(s); +} + +vnread(dev, uio, flags, p) + dev_t dev; + struct uio *uio; + int flags; + struct proc *p; +{ + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnread(%x, %x, %x, %x)\n", dev, uio, flags, p); +#endif + return(physio(vnstrategy, NULL, dev, B_READ, minphys, uio)); +} + +vnwrite(dev, uio, flags, p) + dev_t dev; + struct uio *uio; + int flags; + struct proc *p; +{ + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnwrite(%x, %x, %x, %x)\n", dev, uio, flags, p); +#endif + return(physio(vnstrategy, NULL, dev, B_WRITE, minphys, uio)); +} + +/* ARGSUSED */ +vnioctl(dev, cmd, data, flag, p) + dev_t dev; + u_long cmd; + caddr_t data; + int flag; + struct proc *p; +{ + int unit = vnunit(dev); + register struct vn_softc *vn; + struct vn_ioctl *vio; + struct vattr vattr; + struct nameidata nd; + int error; + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnioctl(%x, %x, %x, %x, %x): unit %d\n", + dev, cmd, data, flag, p, unit); +#endif + error = suser(p->p_ucred, &p->p_acflag); + if (error) + return (error); + if (unit >= numvnd) + return (ENXIO); + + vn = &vn_softc[unit]; + vio = (struct vn_ioctl *)data; + switch (cmd) { + + case VNIOCSET: + if (vn->sc_flags & VNF_INITED) + return(EBUSY); + /* + * Always open for read and write. + * This is probably bogus, but it lets vn_open() + * weed out directories, sockets, etc. so we don't + * have to worry about them. + */ +#ifdef BSD44 + NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vn_file, p); + if (error = vn_open(&nd, FREAD|FWRITE, 0)) + return(error); +#else + nd.ni_nameiop = LOOKUP | FOLLOW; + nd.ni_segflg = UIO_USERSPACE; + nd.ni_dirp = vio->vn_file; + if (error = vn_open(&nd, p, FREAD|FWRITE, 0)) + return(error); +#endif + if (error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p)) { + VOP_UNLOCK(nd.ni_vp); + (void) vn_close(nd.ni_vp, FREAD|FWRITE, p->p_ucred, p); + return(error); + } + VOP_UNLOCK(nd.ni_vp); + vn->sc_vp = nd.ni_vp; + vn->sc_size = btodb(vattr.va_size); /* note truncation */ + if (error = vnsetcred(vn, p->p_ucred)) { + (void) vn_close(vn->sc_vp, FREAD|FWRITE, p->p_ucred, p); + return(error); + } + vnthrottle(vn, vn->sc_vp); + vio->vn_size = dbtob(vn->sc_size); + vn->sc_flags |= VNF_INITED; +#ifdef DEBUG + if (vndebug & VDB_INIT) + printf("vnioctl: SET vp %x size %x\n", + vn->sc_vp, vn->sc_size); +#endif + break; + + case VNIOCCLR: + if ((vn->sc_flags & VNF_INITED) == 0) + return(ENXIO); + vnclear(vn); +#ifdef DEBUG + if (vndebug & VDB_INIT) + printf("vnioctl: CLRed\n"); +#endif + break; + + default: + return(ENXIO); + } + return(0); +} + +/* + * Duplicate the current processes' credentials. Since we are called only + * as the result of a SET ioctl and only root can do that, any future access + * to this "disk" is essentially as root. Note that credentials may change + * if some other uid can write directly to the mapped file (NFS). + */ +vnsetcred(vn, cred) + register struct vn_softc *vn; + struct ucred *cred; +{ + struct uio auio; + struct iovec aiov; + char tmpbuf[DEV_BSIZE]; + + vn->sc_cred = crdup(cred); + /* XXX: Horrible kludge to establish credentials for NFS */ + aiov.iov_base = tmpbuf; + aiov.iov_len = min(DEV_BSIZE, dbtob(vn->sc_size)); + auio.uio_iov = &aiov; + auio.uio_iovcnt = 1; + auio.uio_offset = 0; + auio.uio_rw = UIO_READ; + auio.uio_segflg = UIO_SYSSPACE; + auio.uio_resid = aiov.iov_len; + return(VOP_READ(vn->sc_vp, &auio, 0, vn->sc_cred)); +} + +/* + * Set maxactive based on FS type + */ +vnthrottle(vn, vp) + register struct vn_softc *vn; + struct vnode *vp; +{ +#ifdef NFSCLIENT +#ifdef BSD44 + extern int (**nfsv2_vnodeop_p)(); +#else + extern struct vnodeops nfsv2_vnodeops; + struct vnodeops (**nfsv2_vnodeop_p)() = nfsv2_vnodeops; +#endif + if (vp->v_op == nfsv2_vnodeop_p) + vn->sc_maxactive = 2; + else +#endif + vn->sc_maxactive = 8; + + if (vn->sc_maxactive < 1) + vn->sc_maxactive = 1; +} + +vnshutdown() +{ + register struct vn_softc *vn; + + for (vn = &vn_softc[0]; vn < &vn_softc[numvnd]; vn++) + if (vn->sc_flags & VNF_INITED) + vnclear(vn); +} + +vnclear(vn) + register struct vn_softc *vn; +{ + register struct vnode *vp = vn->sc_vp; + struct proc *p = curproc; /* XXX */ + +#ifdef DEBUG + if (vndebug & VDB_FOLLOW) + printf("vnclear(%x): vp %x\n", vp); +#endif + vn->sc_flags &= ~VNF_INITED; + if (vp == (struct vnode *)0) + panic("vnioctl: null vp"); +#if 0 + /* XXX - this doesn't work right now */ + (void) VOP_FSYNC(vp, 0, vn->sc_cred, MNT_WAIT, p); +#endif + (void) vn_close(vp, FREAD|FWRITE, vn->sc_cred, p); + crfree(vn->sc_cred); + vn->sc_vp = (struct vnode *)0; + vn->sc_cred = (struct ucred *)0; + vn->sc_size = 0; +} + +vnsize(dev) + dev_t dev; +{ + int unit = vnunit(dev); + register struct vn_softc *vn = &vn_softc[unit]; + + if (unit >= numvnd || (vn->sc_flags & VNF_INITED) == 0) + return(-1); + return(vn->sc_size); +} + +vndump(dev) +{ + return(ENXIO); +} +#endif diff --git a/sys/dev/vndioctl.h b/sys/dev/vndioctl.h new file mode 100644 index 00000000000..ace82eea435 --- /dev/null +++ b/sys/dev/vndioctl.h @@ -0,0 +1,61 @@ +/* + * Copyright (c) 1988 University of Utah. + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: Utah $Hdr: fdioctl.h 1.1 90/07/09$ + * + * @(#)vnioctl.h 8.1 (Berkeley) 6/10/93 + */ + +/* + * Ioctl definitions for file (vnode) disk pseudo-device. + */ + +#define _PATH_VNTAB "/etc/vntab" /* default config file */ + +struct vn_ioctl { + char *vn_file; /* pathname of file to mount */ + int vn_size; /* (returned) size of disk */ +}; + +/* + * Before you can use a unit, it must be configured with VNIOCSET. + * The configuration persists across opens and closes of the device; + * an VNIOCCLR must be used to reset a configuration. An attempt to + * VNIOCSET an already active unit will return EBUSY. + */ +#define VNIOCSET _IOWR('F', 0, struct vn_ioctl) /* enable disk */ +#define VNIOCCLR _IOW('F', 1, struct vn_ioctl) /* disable disk */ diff --git a/sys/dev/vnioctl.h b/sys/dev/vnioctl.h new file mode 100644 index 00000000000..ace82eea435 --- /dev/null +++ b/sys/dev/vnioctl.h @@ -0,0 +1,61 @@ +/* + * Copyright (c) 1988 University of Utah. + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: Utah $Hdr: fdioctl.h 1.1 90/07/09$ + * + * @(#)vnioctl.h 8.1 (Berkeley) 6/10/93 + */ + +/* + * Ioctl definitions for file (vnode) disk pseudo-device. + */ + +#define _PATH_VNTAB "/etc/vntab" /* default config file */ + +struct vn_ioctl { + char *vn_file; /* pathname of file to mount */ + int vn_size; /* (returned) size of disk */ +}; + +/* + * Before you can use a unit, it must be configured with VNIOCSET. + * The configuration persists across opens and closes of the device; + * an VNIOCCLR must be used to reset a configuration. An attempt to + * VNIOCSET an already active unit will return EBUSY. + */ +#define VNIOCSET _IOWR('F', 0, struct vn_ioctl) /* enable disk */ +#define VNIOCCLR _IOW('F', 1, struct vn_ioctl) /* disable disk */ |
